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    <script>
      //实现一个函数createIncrementor，接受一个初始值作为参数，返回一个新的函数，
      //每次调用该函数返回一个递增的数字，初始值为createIncrementor函数的参数。
      const createIncrementor = (num) => {
        return function () {
          num++
          return num
        }
      }
      const incrementor = createIncrementor(20)
      console.log(incrementor())
      console.log(incrementor())
      console.log(incrementor())
    </script>
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